The throttle position sensor (TPS) monitors the angle of the throttle plate and sends this information to the engine control unit (ECU). This helps regulate air-fuel mixture, ignition timing, and transmission shifting. If the TPS fails, it can cause hesitation, stalling, poor acceleration, or trigger the Check Engine Light. Replacing a faulty TPS restores smooth performance and fuel efficiency.

What is a throttle position sensor replacement?

This service involves removing the faulty TPS and installing a new one. The sensor is typically mounted on the throttle body and directly connected to the throttle plate shaft. Once installed, the ECU may need to be reset or reprogrammed to ensure accurate readings.

Why do you need a throttle position sensor replacement?

A failing TPS sends incorrect signals to the ECU, which disrupts fuel delivery and ignition timing. This can result in poor drivability, reduced fuel economy, and increased emissions. A replacement ensures proper throttle response and engine performance.

Common signs you need a throttle position sensor replacement

• Hesitation or stumbling when accelerating
• Engine stalling or rough idling
• Poor or inconsistent acceleration
• Unusual or erratic shifting in automatic transmissions
• Check Engine Light illuminated
• Car enters limp mode

What happens during a throttle position sensor replacement?

A mechanic will:

1. Scan the ECU for TPS-related fault codes
2. Inspect the throttle body and wiring connections
3. Remove the faulty throttle position sensor
4. Install a new, manufacturer-approved TPS
5. Reset or reprogram the ECU if required
6. Test drive to confirm smooth throttle response

How much does a throttle position sensor replacement cost?

Replacement typically costs $250–$500, depending on the vehicle make and model. Costs may be higher if reprogramming or throttle body servicing is required.

Is it unsafe to drive with a bad throttle position sensor?

Yes. A faulty TPS can cause hesitation, stalling, or limp mode, which makes driving unpredictable and potentially dangerous. It should be replaced promptly to maintain safe and reliable performance.